Communication-Enhancement of Structural Stability of LiNi0.5Co0.2Mn0.3O2 Cathode Particles against High-Voltage Cycling by Lithium Silicate Addition

Lithium silicate was incorporated within Ni0.5Co0.2Mn0.3(OH)2 precursor particles via an anti-solvent precipitation method to prepare lithium silicate-added LiNi0.5Co0.2Mn0.3O2 (NCM) particles. Lithium silicate was found at the grain boundaries in the NCM secondary particles, which significantly imp...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2019, Vol.166 (6), p.A941-A943
Main Authors: Kato, Yukihiro, Hashinokuchi, Michihiro, Hashigami, Satoshi, Yoshimi, Kei, Yoshida, Hiroyuki, Inagaki, Toru, Haruta, Masakazu, Doi, Takayuki, Inaba, Minoru
Format: Article
Language:English
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Summary:Lithium silicate was incorporated within Ni0.5Co0.2Mn0.3(OH)2 precursor particles via an anti-solvent precipitation method to prepare lithium silicate-added LiNi0.5Co0.2Mn0.3O2 (NCM) particles. Lithium silicate was found at the grain boundaries in the NCM secondary particles, which significantly improved the capacity retention in high voltage operation (3.0-4.6 V). Cross-sectional SEM images revealed that cracks were seriously formed inside the lithium silicate-free NCM particles after cycling, while crack formation was remarkably inhibited for lithium silicate-added NCM. These results suggested that lithium silicate at the grain boundaries strengthened the interfacial-adhesion between primary particles, resulting in the improved cycling stability.
ISSN:1945-7111
DOI:10.1149/2.0591904jes